Class: Computable::Variable

Inherits:
Object
  • Object
show all
Defined in:
lib/computable.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, calc_method) ⇒ Variable

Returns a new instance of Variable.



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# File 'lib/computable.rb', line 20

def initialize(name, calc_method)
  @name = name
  @calc_method = calc_method
  @used_for = {}
  @expired_from = {}
  @count = 0
  @value = Unknown
end

Instance Attribute Details

#calc_method ⇒ Object

Returns the value of attribute calc_method.



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# File 'lib/computable.rb', line 19

def calc_method
  @calc_method
end

#count ⇒ Object

Returns the value of attribute count.



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# File 'lib/computable.rb', line 19

def count
  @count
end

#expired_from ⇒ Object

Returns the value of attribute expired_from.



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# File 'lib/computable.rb', line 19

def expired_from
  @expired_from
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/computable.rb', line 19

def name
  @name
end

#used_for ⇒ Object

Returns the value of attribute used_for.



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# File 'lib/computable.rb', line 19

def used_for
  @used_for
end

#value ⇒ Object

Returns the value of attribute value.



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# File 'lib/computable.rb', line 19

def value
  @value
end

#value_calced ⇒ Object

Returns the value of attribute value_calced.



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# File 'lib/computable.rb', line 19

def value_calced
  @value_calced
end

Instance Method Details

#calc! ⇒ Object 



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# File 'lib/computable.rb', line 33

def calc!
  self.count += 1
  calc_method.call(self)
end

#expire_value ⇒ Object 



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# File 'lib/computable.rb', line 38

def expire_value
  return if used_for.empty?

  puts "expire #{inspect}" if Computable.computable_debug
  used_for.each do |name2, v2|
    if v2.value_calced && !v2.expired_from[name]
      v2.expire_value
      v2.expired_from[name] = self
    end
  end
end

#inspect ⇒ Object 



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# File 'lib/computable.rb', line 29

def inspect
  "<Variable #{name} used_for:#{used_for.keys} expired_from:#{expired_from.keys} has value:#{value==Unknown} value_calced:#{value_calced.inspect}>"
end

#recalc_value ⇒ Object 



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# File 'lib/computable.rb', line 61

def recalc_value
  return if !value_calced || expired_from.empty?

  puts "recalc #{inspect}" if Computable.computable_debug
  expired_from.each do |name2, v2|
    v2.recalc_value
  end

  unless expired_from.empty?
    recalced_value = self.calc!
    if self.value == recalced_value
      revoke_expire
    else
      self.value = recalced_value
      used_for.clear
    end
    expired_from.clear
  end
end

#revoke_expire ⇒ Object 



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# File 'lib/computable.rb', line 50

def revoke_expire
  return if used_for.empty?

  puts "revoke expire #{inspect}" if Computable.computable_debug
  used_for.each do |name2, v2|
    if v2.value_calced && v2.expired_from.delete(name) && v2.expired_from.empty?
      v2.revoke_expire
    end
  end
end